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Mike the Boilerman

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Posts posted by Mike the Boilerman

  1. 10 hours ago, Athy said:

    Er yes, that's exactly what I said. To put it another, simpler, way: almost no one, with the exception of a few liveaboards, is boating at the moment, so almost no one on a boat has any reason to steal diesel because they aren't using any diesel.


    A few?


    5,000 CC liveaboards would be more like it, a good proportion of whom burn diesel on a daily basis to generate their electricity and/or hot water.



  2. 28 minutes ago, TheBiscuits said:

    Don't forget Springers built flat bottomed boats too, and in fact some with semi-flat bottoms and well defined chines.



    My guess would be he was experimenting looking for the cheapest-to-build middle ground. Must have been a total ball-ache never being able to just 'put a boat down' and have it sit square on the ground. Particularly when the next thing to do was get inside to do more work on it. 

  3. Just now, TheBiscuits said:


    Because 2 thin plates joined in a shallow V shape have as much structural strength as the same thickness of flat plate with 2 x 2" steel box section.


    The V is harder to form but requires a lot less material to do so.



    Ah yes, I knew there would be a reason. Use much thinner steel.


    Must be a close-run thing though, given that subsequent bargain basement hull builders ALL choose to do it the 'flat baseplate' way. 



    But interestingly, the only Springer I've even had occasion to use a hole saw to drill a waste hole through the hull on, turned out to be built from 5mm steel. Might even have been 6mm, surprisingly thick anyway, a lot thicker than the 3mm I was expecting. 

  4. 1 hour ago, Alan de Enfield said:

    Springer boats were built to all sizes but most have two distinguishing features: a raised splash board at the bow and, less visibly, a v-shaped hull rather than the usual flat bottom.


    Veering off at a tangent, does anyone know why Sam built them this way?


    Given that every expense was spared in their design and construction, a v-bottom seems to introduce a lot of unnecessary complication to construction and fit-out, and handling during construction.



  5. 10 minutes ago, TheBiscuits said:

    Queen to address nation on Sunday over coronavirus crisis, so what is she going to say? 


    Let's all speculate wildly!  Some starter topics:


    1)  Real lockdown or even martial law imposed.


    b)  Government of National Unity to be formed.


    iii) Royal family all being furloughed on a couple of grand a month and all palaces/castles being converted to NHS overspill.




    4) She's knocking it on the head and handing the reins (pun intended) over to Charlie.





  6. From the Boaters Update just landed in my in box:


    "Can I cruise at night to avoid other boaters?

    No, please don’t cruise after dark. It can cause a danger to others, as well as disturbing moored boats you might pass. We’ve also had reports of night-time cruisers leaving lock gates open and paddles up, which results in the loss of water and potential problems for any boats moored in the area."

  7. 3 minutes ago, ditchcrawler said:

    I wonder what voltage its at, maybe its 48 volts. There was someone who called himself Bottle who had an all electric boat for many years with no problem,


    How did he charge the batteries?


    Most electric boats run perfectly well, its the battery charging that all the problems revolve around.


    If you moor in a marina with a whopping great shoreline supply and always return to base every night then fine, but if you want to stay out then you'll need to take a diesel engine with you anyway and run it all evening once you've moored up. So what's the point?



  8. 3 minutes ago, Alan de Enfield said:

    Over the years there have been a number of threads on the forum where folks with vintage engines just cannot get a way of producing enough 'leccy.


    Its always the same engine, the Lister series with no crankshaft pulley but a pulley driven at half speed by the camshaft. And they are hardly proper vintage anyway!


    Pretty much any other vintage lump can drive an alternator perfectly well. 







  9. 1 hour ago, Callum4878 said:

    hence the preference for a vintage engine.

    Have considered a new build, but don’t like the idea of a long wait.


    I'm afraid a new build is off the menu then. RCD regulations prevent a vintage engine being installed in a new boat.


    • Greenie 1

  10. 11 minutes ago, nicknorman said:

    The energy doesn’t go anywhere, in theory. And yes it can happen, consider a capacitor connected across the mains. The current and voltage waveforms are (theoretically) 90 deg out of phase and so the power dissipated by the capacitor is zero. Replace the capacitor with a resistor of a value to give the same current, and the voltage and current are now in phase, so lots of resistor-frying power is dissipated.


    or consider a resonant circuit comparing an inductor and capacitor in parallel. Once you put energy in by way of alternating current at the resonant frequency into the circuit, that energy continues to circulate (theoretically) indefinitely and is not dissipated.


    I say “theoretically” in the above examples, because in reality a device like a capacitor does have some resistance and so the current will generate some ohmic heating / wasted power. And this is why electric companies don’t like loads with power factor away from unity - it creates a lot of pointless current circulating in the distribution lines that, due to their resistance, causes power loss from ohmic heating for no benefit.


    Thanks Nick. I think I get all that. 


    I notice I sort of answered my own question too, in the way I constructed it. 


    "When the phase angle reaches 90 degrees then the power falls to zero"

  11. 2 minutes ago, alan_fincher said:

    By "all electric" do you mean electric powered, or that it is "gas-less"-i.e.all cooking is by electricity.

    There's a big difference between the two, but I'd recommend neither of them!



    Yes I took the OP to mean electric propulsion, not electric cooking. Perhaps Callum could clarify?




  12. 1 minute ago, Callum4878 said:

    Hi, my wife and I have decided to take the plunge and buy a narrowboat. The aim is to permanent cruise for a few years, and travel extensively around the network, so it’s a 57/58ft boat we’d like really. Bad timing on our part, with this lockdown in place, but we have chosen six boats so far that we’d like to view. Two of are vintage engine type, and one is an all electric boat.

    Any general advice on the buying process and boat types would be gratefully received. This is my first post.


    Don't buy the electric one. There is only one in the UK that works properly. 



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